Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters → IRT Parameters for the Physical Science Scale, by Block and Item, Grade 12 Science National Main Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the physical science scale, by block and item, grade 12 science national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S3	2	K049501	0.29	-2.87	0.00	-3.17	-3.18	6.36
	4	K049502	0.31	2.80	0.00	-0.77	0.95	-0.18
	5	K049503	1.01	-0.14	0.00	†	†	†
S6	1	K049701	0.40	-0.39	0.00	-1.07	1.07	†
	2	K049702	1.06	-0.96	0.00	†	†	†
	3	K049708	1.30	0.10	0.00	†	†	†
	4	K049703	0.96	1.64	0.00	†	†	†
	5	K049704	1.18	-0.65	0.00	0.85	-0.85	†
	6	K049705	0.82	0.01	0.00	-0.70	0.70	†
	7	K049706	1.40	0.22	0.00	†	†	†
	8	K049707	1.18	1.12	0.00	0.96	-0.96	†
S7	1	K105101	0.61	-0.65	0.31	†	†	†
	2	K105701	1.61	1.28	0.30	†	†	†
	5	K105301	2.38	1.40	0.19	†	†	†
	6	K105901	1.18	0.24	0.32	†	†	†
	7	K106001	0.90	4.06	0.09	†	†	†
	9	K105501	1.17	2.02	0.00	0.23	-0.23	†
S9	12	K049914	0.74	0.68	0.00	-1.22	1.22	†
	13	K049912	0.96	1.02	0.00	0.79	-0.79	†
	14	K049913	1.07	0.83	0.12	†	†	†
S10	3	K095701	0.23	1.79	0.28	†	†	†
	8	K096301	0.37	0.72	0.23	†	†	†
	9	K096701	0.62	0.66	0.18	†	†	†
	10	K093301	0.23	1.85	0.29	†	†	†
	11	K098601	0.62	2.11	0.00	1.02	-1.02	†
	13	K093101	2.01	1.23	0.49	†	†	†
	15	K096801	0.74	3.13	0.29	†	†	†
S11	2	K051401	1.12	0.67	0.40	†	†	†
	3	K051501	1.29	1.37	0.32	†	†	†
	7	K051901	1.41	1.89	0.33	†	†	†
	11	K052301	0.37	0.26	0.00	†	†	†
	12	K052401	0.55	1.15	0.00	-0.05	-0.24	0.29
	13	K052402	0.49	3.39	0.00	2.92	-2.92	†
S12	1	K046801	0.61	-0.39	0.27	†	†	†
	2	K046901	0.74	-0.58	0.13	†	†	†
	4	K047101	1.01	-0.66	0.15	†	†	†
	5	K047201	0.49	-0.47	0.00	0.59	-1.55	0.96
	7	K047401	0.48	0.44	0.00	-0.69	0.69	†
	12	K047901	1.07	-0.50	0.00	†	†	†
S13	1	K048201	1.40	-0.21	0.21	†	†	†
	4	K048501	0.95	0.26	0.28	†	†	†
	5	K048601	0.54	0.17	0.00	0.95	-0.95	†
	9	K049001	1.46	1.93	0.00	†	†	†
	10	K049101	0.27	-1.12	0.24	†	†	†
S14	1	K052601	0.57	-0.19	0.21	†	†	†
	2	K052701	0.82	0.92	0.17	†	†	†
	7	K053101	0.87	1.65	0.00	†	†	†
	8	K053102	0.66	2.54	0.00	†	†	†
	9	K053201	1.47	1.15	0.11	†	†	†
	10	K053301	2.80	0.72	0.20	†	†	†
	11	K053401	0.46	0.27	0.19	†	†	†
S20	1	K096601	0.63	-1.71	0.26	†	†	†
	3	K102601	0.97	0.86	0.19	†	†	†
	4	K102701	0.19	-2.78	0.27	†	†	†
	7	K093401	1.08	0.55	0.24	†	†	†
	14	K093201	0.94	0.51	0.29	†	†	†
	15	K096501	1.12	1.98	0.00	-0.04	0.04	†
	19	K096401	2.24	1.67	0.09	†	†	†
S21	1	K058601	0.76	-0.14	0.38	†	†	†
	5	K059001	0.37	-4.08	0.00	†	†	†
	6	K059101	0.50	1.15	0.00	†	†	†
	10	K059501	2.60	1.94	0.09	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. NOTE: For item j, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji is the category threshold parameter for category i. The c-parameter value is exactly zero for items scaled with the two-parameter logistic model or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment.

Printer-friendly Version